let x = !true

let m = -1
let m = -.2.5
let m = ~~~2
let x = +5
let x = +.5.4
let b = -1n
let b = +1n
let m = ~~~2n

let sum = -a - -b

let bitop = ~~~a ^^^ ~~~b

let x = ~~~-1n
let x = -~~~1n
let x = ~~~(-1n)
let x = -(~~~1n)
